diff --git a/SerialPorts.c b/SerialPorts.c
index b4d0235..57b1701 100644
--- a/SerialPorts.c
+++ b/SerialPorts.c
@@ -600,12 +600,12 @@ void SerialPorts_Init(tRs485DirectionPins *directionPins) {
     env->cliVirtualPortOut_Io = SerialPortVirt_GetIo(&env->cliVirtualPortOut);
 
 
-    SerialPortUsb_Init(&env->SerialPortUsb1, 1, 1024, 1024);
+    SerialPortUsb_Init(&env->SerialPortUsb1, 1, 1024, 0);
     env->SerialPortUsb1IO = SerialPortUsb_GetIo(&env->SerialPortUsb1);
     env->SerialPortUsb1SnifferIO = SerialPortUsb_GetSnifferIo(&env->SerialPortUsb1);
 
 
-    SerialPortUsb_Init(&env->SerialPortUsb2, 2, 1024, 1024);
+    SerialPortUsb_Init(&env->SerialPortUsb2, 2, 1024, 0);
     env->SerialPortUsb2IO = SerialPortUsb_GetIo(&env->SerialPortUsb2);
     env->SerialPortUsb2SnifferIO = SerialPortUsb_GetSnifferIo(&env->SerialPortUsb2);